====== Connecting with SSH ======
[[http://en.wikipedia.org/wiki/Secure_Shell|Secure Shell]], usually referred to as SSH, is an encrypted and secure method of communicating between two computers.  It can be used to access a command prompt or to transfer files from both on and off campus.  Off campus access //does not// require use of CU's VPN.

===== Command prompt access =====
Any software which uses the SSH protocol version 2 can be used to connect to the [[computing:IBG servers|IBG servers]].  Below are free options for the Windows and Mac platforms.
==== From a Windows computer ====
[[http://www.chiark.greenend.org.uk/~sgtatham/putty/|PuTTY]] is a free version of SSH for Windows.  To install it, go to the [[http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html|download PuTTY]] page and choose the download under the
  A Windows installer for everything except PuTTYtel
section.  As of this writing, the current installer is ''putty-0.62-installer.exe''.
Run the downloaded program to install ''PuTTY''.

Once installed run the ''putty.exe'' program.  Depending on the options you choose, it may be under the Start menu, or on the desktop.

{{ putty-configuration.png?nolink |PuTTY Configuration}}

The window shown above will appear.  Enter ''delta.colorado.edu'' (or [[computing:IBG Servers|another IBG server name]]) into the ''Host Name'' field and press ''Open''.  The first time connecting to a particular computer will cause a Security Alert from ''PuTTY''
{{ putty-security-alert.png?nolink |PuTTY Security Alert}}
The purpose of this alert is to validate the signature of the machine you are connecting to is what you expect it to be.  The signature for ''delta.colorado.edu'' is
  1024 41:3d:a0:c1:3d:ff:e4:e8:74:ec:cc:8f:4d:f5:cc:e0
[[computing:IBG Servers|The keys for IBG's other servers]].  Once ''PuTTY'' has recorded the key for a particular machine, it will not ask for it again.

At the ''login as:'' prompt enter your IBG ''username''.  At the ''Password:'' prompt, enter your password.

==== From a Mac ====
Start the ''terminal'' program.  At the command prompt, enter the command
  ssh delta.colorado.edu
You will be asked to accept ''delta'''s key (see above) the first time you connect.  You may also enter the name of [[computing:IBG Servers|another IBG server]]).

===== File Transfer =====
Any software which uses the SFTP or SCP portions of the SSH protocol version 2 can be used to transfer files with the [[computing:IBG servers|IBG servers]].
==== From a Windows Computer ====
[[http://winscp.net/|WinSCP]] is a free file transfer utility for Windows which uses the SSH protocol.  [[http://winscp.net/eng/download.php|Download]] and install the most recent version of the WinSCP ''Installation Package''.

Run ''WinSCP'' and enter ''delta.colorado.edu'' (or [[computing:IBG Servers|another IBG server name]]) into the ''Host Name:'' field.  Enter your IBG ''username'' and ''password'' into the ''User Name:'' and ''Password:'' fields.  Click the ''Login'' button.

The first time you connect a warning will be presented with ''delta'''s key (see above).  If the key is correcty, select ''Yes'' to accept it.

Depending on how it is configured, ''WinSCP'' will either show one window with your remote files on ''delta'' or two panels, with your local and remote files.

==== From a Mac ====
[[http://rsug.itd.umich.edu/software/fugu/|Fugu]] is a graphical SSH file transfer program for the Mac.  [[http://rsug.itd.umich.edu/software/fugu/download.html|Download]] and install Fugu.  Connect to the host ''delta.colorado.edu'' using your IBG ''username'' and ''password'' to transfer files.